The MAT.84-F5 is a Chilean, plastic cased, minimum metal anti-tank blast mine. The mine has a small central pressure plate on the top of the case which is made from 3 mm thick, olive green, high-impact plastic. The mine is armed before it is laid by unscrewing a safety plug from the side of the mine. The mine is believed to be in service with the Chilean armed services.
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References
MAT.84-F5 mine Wikipedia(Text) CC BY-SA